Exaddunep

The 4 parts of the name, "exo", "add", "uni" and "ep", mean \(10^{18}\), addition, 1, and \(\varepsilon\)-ordinals respectively, which form \(\varepsilon_1+10^{18}\) when concatenated backwards (where "uni" and "ep" form \(\varepsilon_1\)). So the full name indicates the ordinal index of the number.